XML Parsing Error: junk after document element

Why is this at the top of your RSS?

<title>resetblog by reset group | design link and stuff update everyday</title>

If you edited a core file to add that, remove it.
If you don’t know where it came from, disable all plugins.
Check.
Enable plugins one at a time, checking after each to see if you can find out what’s adding it.

thanks for reply.can u tell me what’s core file name . about rss like “index.php” or what.i can’t find it

i enable all plug-in i think it’s from core file but i don’t know what’s file

thanks again ??